Way of the vigorous shot

Most monks tends to use primitive weapons while up in their
monasteries, daggers, spears, axes. All of these can be
wielded effectively with their martial arts and are simple to
learn and master. However, there are a select few monks who
choose to go for the more inventive means of dealing damage,
and take up the use of certain firearms in order to deal their
damage. The firearm, to most monks, may seem a loud and
barbaric lead burpers that have no class and style to them.
But a monk who goes down the way of the vigorous shot has
learned to channel their Ki into their firearms and make them
extensions of their own serene will. Beware those who cross
these Gun Fu artists, for they will end up dead before they
know what hit them.
Bonus proficiencies
When you take this tradition at 3rd level, you learn how to
infuse your Ki into firearms and let it flow through the
bullets. You gain proficiency in two of the following weapons:
Pistols, Revolvers, Rifles, or Carbines. These weapons are
not considered monk weapons for you and thus do not qualify
for use with the Martial Arts feature, but you can use the
Martial Arts damage die as piercing damage in place of the
damage these weapons would deal.
Gun Fu
Once you reach 3rd level and take this tradition, you have
trained yourself to flow your Ki through your firearms to
perform special maneuvers in place of your Martial Arts and
Ki moves. You get the following maneuvers.
When you make the attack action with a firearm that you
are proficient in, you can make one unarmed strike or a
ranged attack during your turn as a bonus action. Use
your martial arts die in place of the normal damage for
this attack. Spend a Ki point to make two ranged attacks,
using your Martial Arts die in place of the damage.
You can spend 2 Ki points in order to shoot past your
firearm's normal range without disadvantage.
When you get the Extra Attack feature at 5th level, you
ignore the reload action and loading times for firearms
when making the additional attacks.
You can use Deflect Missiles by using your reaction to fire
a shot at a ranged weapon attack targeting your ally, at the
cost of 1 Ki point. You can add Ki points to your attack roll.
Missiles have 18 AC, and ranged spell attacks have 19 AC.
Force Of Bullets
When you reach 6th level, you have learned to harness the Ki
in your body to empower your firearms beyond thier normal
potential. Your attacks made with the firearms you chose in
your Bonus Proficiencies feature count as magical for the
purposes of overcoming resistance and immunity to
nonmagical attacks and damage. You can also use your
Stunning Strike feature for your ranged weapon attacks
using these firearms.
Additonally, you can add your Martial Arts die to your
firearm's damage roll once per turn.
You can spend a Ki point in order to ignore cover bonus for
your firearm's attacks out to their normal range as you curve
the bullets around walls and cover.
Severe Salvo
At 11th level, once per turn, when you make a ranged attack
with firearms you are proficient in, you can spend 1-6 Ki
points to conjure addional bullets equal to the amount of Ki
you spend that you fire from your gun at any creature within
your gun's maximum range as beams of pure energy. Any
creature targeted by these bullets must succeed a Dexterity
saving throw against your Ki save DC. On a failed save, they
take 2d12 + your Dexterity modifier force damage. They take
half that damage on a successful save.
You can only target a creature with two beams at once,
including the creature you made the attack roll against.
Inner Focus
At 17th level, you have learned to steady your mind to make
nearly any shot with the firearms you chose in your Bonus
Proficiencies feature. So long as you take a bonus action to
aim your gun or have only moved half your movement speed
in any direction, you have advantage on attacks made with
these weapons within their normal range. Once per short
rest, if you miss a firearm attack roll, you can reroll the attack,
but must use the new roll. You can spend 2 Ki points to get
advantage on the reroll.